Explain concept of counter bore in radial drilling machine, Mechanical Engineering

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Explain concept of Counter Bore and countersink in radial drilling machine

Counter Bore :-

This operation uses a pilot to guide the cutting action to accommodate the heads =of bolts. Fig. 10 illustrates the counter boring, countersunk and spot facing processes. 

Countersink:-

Special angled cone shaped enlargement at the end of the hole to accommodate the screws. Cone angles of 60°, 82°, 90°, 100°, 110°, 120°

 


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